236 INDEX. 



PLATES. 



Bucania 



devonica _ - 26 



Gallonema 



bellatula -- 20 



clarki 24 



imitator 20 



Cyclonema 



cancellata - 20 



multilira 22 



rugaelineata 33 



Euomphalus 



deceini 21 



sampsoni --- 21 



Loxonema 



hamiltoniae 31 



hydraulicum 20 



laeviusculum 22 



rectistriatum - 



Macrocheilus 



carinatus - - - 20 



Murchisonii 



desiderata 26 



petila _ 31 



Platyceras 



bucculentum 23 



compressum 25 



conicum 25 



dumosum . - 23 



dumosum, var. rarispinum 23 



echinatum -- 31 



erectum - .-. 



milleri 25 



nmltispinosum 25 



rictum - - 



symmetricum 23 



thetis - 



unguif orme 



ventricosum 25 



